Tocopherols are amphipathic antioxidants synthesized exclusively by photosynthetic organisms. Tocopherol levels change significantly during plant growth and development and in response to stress, likely as a consequence of the altered expression of pathway-related genes. Homogentisate phytyltransferase (HPT) is a key enzyme limiting tocopherol biosynthesis in unstressed Arabidopsis leaves (E. C...

During chemical refining steps (neutralization, bleaching and deodorization) of crude cottonseed oil (CSO), minor and major components, namely, tocopherols, sterols and fatty acids were evaluated by HPLC and GLC. HPLC analysis of total tocopherols (T) revealed that loss in these components were 7.12, 12.28 and 18.47 % in neutralized, bleached and deodorized oil respectively. On the other side, ...

Carotenoids and tocopherols are powerful antioxidants synthesized in plants from a common precursor. They may offer significant health benefits to humans. Seed oils have been shown to possess high levels of tocopherols, but little is known about their levels in the edible portions of most vegetable crops. A two-year field experiment was conducted at two locations to assess levels of major carot...

Tocols are present in various foods, mostly fruits and plant seeds. Edible oils the most important natural dietary sources of tocopherols tocotrienols, collectively known as tocols. Tocopherols tocotrienols considered beneficial for their antioxidant effect which impacts on prevention different health conditions. This perspective is addressed to give an updated picture tocol occurrence foods. M...

background antioxidant compounds have been shown to slow down the development of chemically induced tumors. it has been estimated that most of human cancer cases are due to environmental factors and would be preventable if the main risks could be identified. the potential of vitamin e as a cancer preventive agent has been studied and individuals whose intake of vitamin e was above average showe...

Vitamin E consists of eight different variants: α-, β-, γ-, and δ-tocopherols (saturated phytyl tail) and α-, β-, γ-, and δ-tocotrienols (unsaturated phytyl tail). Cancer prevention studies with vitamin E have primarily utilized the variant α-tocopherol. To no avail, a majority of these studies focused on variant α-tocopherol with inconsistent results. However, γ-tocopherol, and more recently δ...

The number of determinations of tocopherols in muscle tissue reported in the literature is small. This may be due to the complexity and timeconsuming technique of both the chemical and biological methods, as well as to the poor agreement between the two assays. An accurate account of the chemical assay of vitamin E has recently been compiled in Dr. K. C. D. Hickman’s 1aboratory.l The fact that ...

Vitamin E has been recognized as an essential vitamin since their discovery in 1922. Although the functions of tocopherols are well established, tocotrienols have been the unsung heroes of vitamin E. Due to their structural differences, tocotrienols were reported to exert distinctive properties compared to tocopherols. While most vegetable oils contain higher amount of tocopherols, tocotrienols...

When most people think of vitamin E, more often than not they think of tocopherols—the most prominent being alpha-tocopherol. However, vitamin E refers to a family of eight distinct compounds: four tocopherols and four tocotrienols. While most people are familiar with alpha-tocopherol, other tocopherol forms include beta-, gamma-, and delta-. Similarly, the vitamin E family includes alpha-, bet...

BACKGROUND Some studies have shown potential benefit of vitamin E on platelet function, but several clinical trials failed to show improved cardiovascular outcome with alpha-tocopherol supplementation. Gamma-tocopherol, a major dietary form of vitamin E, may have protective properties different from those of alpha-tocopherol. OBJECTIVE We compared the effects of supplementation with alpha-toc...